* test(integration): stop GET /__observations from draining the upstream log
GET /__observations used to empty the queue, so a second read in a test
saw nothing and a "never reached upstream" check could pass whether or not
the request was forwarded. GET now returns every request since the last
reset and DELETE /__observations is the reset. An autouse fixture resets
the worker upstream before each test, which also covers tests that read
without the gateway fixture.
Discarded reads used as resets become DELETEs, helpers that accumulated
drained reads now read one snapshot, and tests with several phases reset
between them. The three vacuous negative checks (rag allowlist, guardrail
opt-out chaos, xAI batch output) now assert the absence on the same read
that shows a request which did reach the upstream.
* style(integration): space the observations unit test like its neighbours
* test(integration): add read-replica routing harness
* refactor(integration): hoist the maintenance url imports
* fix(integration): keep per-test databases and the witness sequence readable under replica roles
* fix(integration): opt bespoke database and pool tests out of the injected read replica
* test(integration): commit recorded replica routing expectations
* fix(integration): judge routing by role containment so shrinking role sets do not fail
* fix(integration): run the pool-limit shutdown choreography on the superuser database url
* ci(integration): add the mcp group to the replica matrix
* fix(integration): judge routing by exact role sets with a named either-role allowlist
* test(integration): drop containment-era routing expectations for re-recording
* chore(integration): drop docstrings from the replica harness scripts
* docs(integration): describe exact routing matching and the either-role list
* test(integration): record exact replica routing expectations
* test(integration): allow the SELECT 1 health probe on either role
* test(integration): replace committed routing expectations with an on-demand base-vs-head parity run
* test(integration): fix parity env scope, readme wording, and seed-deterministic serialization test
* test(integration): make the sorted-role serialization test deterministic in-process
* test(integration): swap all product code in parity runs and pin role gains
* ci(integration): force tracked-file removal before parity checkout
---------
Co-authored-by: yuneng <yuneng@berri.ai>
Adds owned local TCP peers, a Redis process helper and SigV4 helpers to
tests/integration, and integration contracts for Anthropic and Bedrock wire
shapes, Bedrock role configuration, S3 wire, observed routing, Redis
recovery and stream contracts. Consolidates the four commits previously
stacked on litellm_integration_accounting onto its main-merged tip
